package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.DishService;
import com.sky.service.SetmealService;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void add(ShoppingCartDTO shoppingCartDTO) {
        // 查询当前菜品或套餐是否在购物车中
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0){
            // 如果已经存在，数量加1
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            // 如果不存在，添加到购物车，数量默认为1

            Long dishId = shoppingCartDTO.getDishId();
            Long setmealId = shoppingCartDTO.getSetmealId();
            if (dishId != null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());


            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }
    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }
    /**
     * 清空购物车
     */
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.delete(userId);
    }
    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        // 查询当前菜品或套餐是否在购物车中
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 如果已经存在且大于1，数量减1
        if (list != null && list.size() > 0 && list.get(0).getNumber() > 1){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() - 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            // 如果已经存在且数量为1，从购物车中删除
            shoppingCartMapper.deleteOne(shoppingCart);
        }



    }
}
